CHICAGO, IL - JANUARY 23: A truck is covered in ice as firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: A truck is covered in ice as firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a ... more

CHICAGO, IL - JANUARY 23: A firefighter helps to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: A firefighter helps to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. less

CHICAGO, IL - JANUARY 23: Firefighters work to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures ... more

Firefighters continue battling a massive warehouse fire Wednesday, Jan. 23, 2013 in Chicago, that officials say is one of the largest fires in recent years. More than 170 firefighters have responded to the five-alarm blaze that started at about 9 p.m. Tuesday Jan, 22, 2013. (AP Photo/M. Spencer Green) less

Firefighters continue battling a massive warehouse fire Wednesday, Jan. 23, 2013 in Chicago, that officials say is one of the largest fires in recent years. More than 170 firefighters have responded to the ... more

Firefighters continue battling a massive warehouse fire Wednesday, Jan. 23, 2013 in Chicago, that officials say is one of the largest fires in recent years. More than 170 firefighters have responded to the five-alarm blaze that started at about 9 p.m. Tuesday Jan, 22, 2013. (AP Photo/M. Spencer Green) less

Firefighters continue battling a massive warehouse fire Wednesday, Jan. 23, 2013 in Chicago, that officials say is one of the largest fires in recent years. More than 170 firefighters have responded to the ... more

Firefighters continue battling a massive warehouse fire Wednesday, Jan. 23, 2013 in Chicago, that officials say is one of the largest fires in recent years. More than 170 firefighters have responded to the five-alarm blaze that started at about 9 p.m. Tuesday Jan, 22, 2013. (AP Photo/M. Spencer Green) less

Firefighters continue battling a massive warehouse fire Wednesday, Jan. 23, 2013 in Chicago, that officials say is one of the largest fires in recent years. More than 170 firefighters have responded to the ... more

Icicles form on a fire hose from single digit temperatures as Chicago firefighters battle a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast) less

Icicles form on a fire hose from single digit temperatures as Chicago firefighters battle a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in ... more

Photo: Charles Rex Arbogast, ASSOCIATED PRESS

Icicles form on a fire hose from single digit temperatures as... Photo-4075272.55602 - Beaumont Enterprise

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Chicago firefighters battle a five-alarm blaze in single digit temperatures at a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Chicago firefighters battle a five-alarm blaze in single digit temperatures at a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Chicago firefighters are covered in ice from single digit temperatures as they take a break from a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast) less

Chicago firefighters are covered in ice from single digit temperatures as they take a break from a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in ... more

Photo: Charles Rex Arbogast, ASSOCIATED PRESS

Chicago firefighters are covered in ice from single digit... Photo-4075271.55602 - Beaumont Enterprise

Image 19 of 23

A Chicago firefighter's helmet is covered with ice from single digit temperatures during a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast) less

A Chicago firefighter's helmet is covered with ice from single digit temperatures during a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. ... more

The frozen ice covered pair of gloves belonging to a Chicago firefighter stand on a railing behind him in single digit temperatures during a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood rages Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast) less

The frozen ice covered pair of gloves belonging to a Chicago firefighter stand on a railing behind him in single digit temperatures during a five-alarm blaze in a warehouse on the city's South Side, Bridgeport ... more